linux-kernel - [PATCH v8 3/5] x86/mm: Make tdx_enc_status

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Date:   Wed,  8 Jun 2022 19:52:18 -0700
From:   Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org
Cc:     "H . Peter Anvin" <hpa@...or.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kai Huang <kai.huang@...el.com>,
        Wander Lairson Costa <wander@...hat.com>,
        Isaku Yamahata <isaku.yamahata@...il.com>,
        marcelo.cerri@...onical.com, tim.gardner@...onical.com,
        khalid.elmously@...onical.com, philip.cox@...onical.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH v8 3/5] x86/mm: Make tdx_enc_status_changed() vmalloc address compatible

set_memory_*crypted() APIs are used to change encryption or decryption
page attributes for the given address. It also by default support the
conversion for the vmalloc'ed memory address.

In TDX Guest, tdx_enc_status_changed() function is triggered by
set_memory_*crypted() APIs when converting memory from/to shared or
private. Internally this function uses __pa() for physical address
conversion, which breaks the vmalloc address compatibility of the
set_memory_*crypted() APIs.

So add support to fix the vmalloc'ed address compatibility issue.

Acked-by: Wander Lairson Costa <wander@...hat.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
---
 arch/x86/coco/tdx/tdx.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index 94542876f26a..445f58547776 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -15,6 +15,7 @@
 #include <asm/idtentry.h>
 #include <asm/irq_regs.h>
 #include <asm/desc.h>
+#include <asm/io.h>
 
 /* TDX module Call Leaf IDs */
 #define TDX_GET_INFO			1
@@ -678,8 +679,14 @@ static bool try_accept_one(phys_addr_t *start, unsigned long len,
  */
 static bool tdx_enc_status_changed(unsigned long vaddr, int numpages, bool enc)
 {
-	phys_addr_t start = __pa(vaddr);
-	phys_addr_t end   = __pa(vaddr + numpages * PAGE_SIZE);
+	phys_addr_t start, end;
+
+	if (is_vmalloc_addr((void *)vaddr))
+		start = vmalloc_to_pfn((void *) vaddr) << PAGE_SHIFT;
+	else
+		start = __pa(vaddr);
+
+	end = start + numpages * PAGE_SIZE;
 
 	if (!enc) {
 		/* Set the shared (decrypted) bits: */
-- 
2.25.1